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Sopharma Tribestan is a completely natural non-hormonal herbal (phytochemical) biostimulator derived from the plant Tribulus terrestris L., Bulgaricum, which contains predominantly saponins of furostanol type (not less than 45% in Tribestan), with prevailing quantity of protodioscin. Over 25 years of experience with natural herbal Tribestan administration has seen no toxicity and negative effects to date.* This non-hormonal tribulus terrestris supplement increases testosterone levels.